Why do we get pins and needles?
The Real Answer
Pins and needles usually happen when a nerve is temporarily compressed, often because you've been sitting, leaning, or sleeping in one position for too long. The pressure disrupts normal nerve signaling and can also reduce blood flow around the compressed area.
When you move and relieve that pressure, the nerve begins returning to its normal signaling pattern. That recovery can feel like tingling, prickling, buzzing, burning, or brief numbness as the area "wakes up."
A short episode caused by position usually fades after you move. Tingling that persists, keeps returning without an obvious pressure or position trigger, or occurs with other concerning symptoms can have other causes and should not simply be assumed to be an ordinary sleeping limb.
Pins and needles turn standing up into a test you start before your foot is ready. You put your weight on it, instantly regret it, then keep taking tiny test steps around the room until you can walk without making that face.
Why People Ask This
People ask because the sensation appears after something as ordinary as sitting or sleeping awkwardly, then becomes more intense just as the limb starts working normally again. The combination of numbness followed by sharp tingling makes it feel as though something electrical suddenly switched back on inside the arm or leg.